An approach for selective beacon forwarding to improve cooperative awareness

Schmidt, Robert; Lasowski, Robert; Leinmiiller, Tim; Linnhoff‐Popien, Claudia; Schäfer, Günter

doi:10.1109/vnc.2010.5698243

Cited by 21 publications

(15 citation statements)

References 9 publications

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“…It can be given for any pair of sender and receiver. Awareness quality [17] Percentage of vehicles within a given distance from which CAMs were received and have not expired yet. This is given for a certain vehicle.…”

Section: Performance Metricsmentioning

confidence: 99%

Decentralized Congestion Control Techniques for VANETs

Smely

Rührup

Schmidt

et al. 2015

Vehicular Ad Hoc Networks

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Direct vehicle-to-vehicle (V2V) communication must operate reliably and with low latency under all circumstances to allow for imminent collision prevention. However, the amount of data to be exchanged is limited by the physical limitations of the communication channel. In vehicular ad hoc networks (VANETs), this limitation is particularly relevant when vehicle density rises and thus lots of information needs to be exchanged, bringing the communication system into a congested state. Rapidly changing topology, channel characteristics, distributed medium access, and challenging active safety application requirements cause many challenges to the resource management. This chapter reviews these issues to motivate suitable Decentralized Congestion Control (DCC) algorithms and cross-layer coordination mechanisms. In particular, it is shown that performance degradations like packet losses, the reduction of the effective communication range, and packet transmission delays are correlated with the channel load. The strategy of the DCC is to avoid these degradations by limiting the load offered by each vehicle to the radio channel, such that a certain channel load threshold is not significantly exceeded. This mitigates the communication range degradation and keeps the packet latencies moderate. The DCC is already part of specifications in the European Telecommunications Standards Institute (ETSI), e.g. ETSI TS 102 687.

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Section: Performance Metricsmentioning

confidence: 99%

Decentralized Congestion Control Techniques for VANETs

Smely

Rührup

Schmidt

et al. 2015

Vehicular Ad Hoc Networks

Self Cite

View full text Add to dashboard Cite

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“…For the investigations in this chapter we switch from measurements of mean packet loss statistics to the measurement of Awareness Quality. We use a definition of Awareness Quality proposed by Schmidt et al in [124], where it was used as a metric to evaluate adaptive adjustments of Distributed Congestion Control (DCC) parameters [92]. application level evaluation…”

Section: Discussionmentioning

confidence: 99%

“…Nevertheless, this aspect has not been considered enough in previous proposals. We extend this approach further in Section 13 and use Awareness Quality [124] as a fine grained metric that allows us to further investigate the properties of certificate omission schemes.…”

Section: Related Workmentioning

confidence: 99%

“…Awareness Quality as an assessment of vehicular communication effectivity was first introduced as a metric in [124]. Awareness in this context is defined as the knowledge about the presence of neighboring vehicles.…”

Section: Awareness Qualitymentioning

confidence: 99%

“…The Awareness Quality metrics described above were introduced and first defined by Schmidt et al in [124]. A functionally equivalent metric has been introduced independently in [14] under the name Neighborhood Awareness Ratio.…”

Section: Awareness Qualitymentioning

confidence: 99%

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Scalable broadcast authentication for V2V communication

Feiri¹

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A B S T R A C TVehicular Ad Hoc Networking (VANET) technology is, at it's core, the simple idea of outfitting vehicles with wireless data communication equipment for automatic information exchange. This technology is expected to serve as a foundation for a set of novel safety, automation, and infotainment applications. The most prominent among these applications are expected to be driver assistance systems which also support advanced levels of automated driving. These applications stand to benefit from enhanced situational awareness, which is made possible through the cooperative exchange of information about environmental influences and the presence and condition of surrounding vehicles.Wireless networking technology and networking in general are well understood domains in computer science. However, the context of connected vehicles and the associated requirements and communication patterns imposes a set of unique challenges, which require solutions that differ from established networking practices. The susceptibility of wireless communication to packet loss and the very high mobility of vehicular communication nodes make VANET technology extremely volatile. At the same time the usage in safety critical applications demands very low latency and high availability of the communication infrastructure for frequent information exchange. And on top of these challenges security and privacy need taken into account in the design of the overall communication infrastructure. Classic solutions for stable networks cannot provide optimal performance characteristics under these conditions. The focus of this work is specifically on vehicle-to-vehicle technology (V2V), which is a subset of the more general vehicle-to-anything (V2X) topic. This subset of VANET is concerned with the direct information exchange among vehicles without the involvement of additional infrastructure, which may or may not be available to vehicles which driving. Direct V2V communication is expected to always be available between vehicle within a safety critical range. Therefore, this communication path is expected to be used to enable the most safety critical applications.The scalability of security solutions for vehicular communication remains an untested aspect of ongoing efforts to bring VANET technology to the market on a larger scale. Filed operational test projects have started to trial VANET deployments to investigate, but penetration rates are too low to allow for realistic extrapolations of future scalability problems. This dissertations contributes to the research efforts that support the development of secure vehicular communication techv nology through investigations of attributes and solutions for scalable security for V2V broadcast communication.Part II reviews security requirements and provides detailed quantifications of performance requirements for security in V2V broadcast communication. These requirements define the solution space for applicable broadcast authentication techniques. Additionally, the review of achievable security and pr...

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